Drain assembly



FIG. 1 is a front view of my design, the rear view being a mirror image thereof;

FIG. 2 is a perspective view of my design;

FIG. 3 is a side view of my design, the opposite side view being a mirror image thereof;

FIG. 4 is a top view of my design; and,

FIG. 5 is a bottom view of my design.

The features shown in broken lines in FIG. 1 are shown for illustrative purpose only and form no part of the claimed design. 

The ornamental design for a drain assembly, as shown and described. 